ABSTRACT:
Renewable
energy sources and technologies have the potential to provide solutions to the
longstanding energy problems being faced by developing countries. The renewable
energy sources like wind energy, solar energy, geothermal energy, ocean energy,
biomass energy and fuel cell technology can be used to overcome energy shortage
in India. This paper proposes a modified multi-level inverter (MLI) topology
for Hybrid Renewable Energy Sources (HRES) and a design of hybrid solar-wind power
generation model with 9-level, 13-level and 17-level inverter topologies. A
HRES connected to a modified Cascaded H-Bridge Multi Level Inverter (CHB-MLI)
is developed, whose switches are controlled using Artificial Neural Network
(ANN) model. The proposed hybrid energy system model consists of 10 Metal Oxide
Semiconductor Field Effect Transistors (MOSFETs) that intend to give 17 levels
of output voltage. The proposed topology performs effectively with reduced
number of components and reduced Total Harmonic Distortion (THD). The
performance of the proposed system is analyzed by designing the model in
MATLAB/SIMULINK environment. The simulation results of the proposed inverter
for the HRES application are compared with the results of the existing
topologies to show the effectiveness of the proposed model.
1. Battery
energy storage system (BESS)
2. Modified
cascaded H-bridge Multi-level inverter (MCHBMLI)
3. Total
harmonic distortion (THD)
CONCLUSION:
In
this paper, 9-level, 13-level and 17-level inverters are designed by employing modified
cascaded MLI, followed by ANN as a control approach for the inverter. Using the
ANN method, the MPP exactly searching when the solar irradiance changes
sharply, and it can make the system work under a stable mode. The advantage of
the ANN-based PV model method is the fast MPP approximation according to the
parameters of the PV panel. The proposed new MPPT algorithm can search the MPP
fast and exactly based on the feedback voltage and current with different solar
irradiance and temperature of the environment. The simulations are performed in
MATLAB/SIMULINK environment. The output voltage waveform shows less distortion
with a reduced number of power switches and is validated by calculating THD as
a performance measure. The results attained from the proposed model exhibits
superiority over the previously suggested models when compared. The proposed
modified system can be analyzed in the future, with different sources such as
fuel cell, diesel generator, etc. in the standalone microgrid topology. This is
more cost-effective due to the use of reduced number of switches and other components.
Thus it helps in improving the total harmonic distortions as per the IEEE 519
standards, in terms of power quality of the islanded microgrid. The limitation
of the proposed topology is that, in case of a failure of one ofH-bridges,
theMLI can still be operated with decreased number of levels. However, full
power cannot be supplied to the load. This can be improved by designing a fault
tolerant MLI topology in the future.
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